Abstract
The structural (lattice metric) and elastic characteristics of a row of YBaCo4 – yZnyO7 + x cobaltites with diamagnetic dilution of the cobalt subsystem are experimentally studied in the structural phase transition range. For stoichiometric vacuum annealed samples, parameter Δa/a does not exhibit singularities during the structural transition and parameters Δb/b and Δc/c undergo jumps, which have similar magnitudes and different signs. This behavior leads to jumps in anisotropic (orthorhombic) deformation, εo ≈ –4 × 10–3, and isotropic (volume change) deformation, ΔV/V ≈ –1 × 10–3. Upon substitution by Zn ions, the character of structural distortion changes insignificantly and the transition temperature TS decreases linearly. The structural distortion in stoichiometric samples is accompanied by characteristic anomalies of Young’s modulus ΔE(T)/E0 and internal friction in the TS region, and the anomalies completely disappear for nonstoichiometric quenched samples. Diamagnetic substitution by Zn ions leads to a sharp decrease and then complete disappearance of the jump in the ΔE(T)/E0 curve. This behavior can be related to a change in the relation between the isotropic and anisotropic deformations during the structural transition in the course of substitution in the cobalt subsystem.
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Kazei, Z.A., Snegirev, V.V., Stolyarenko, M.S. et al. Structural Transitions in Frustrated YBaCo4 – yZnyO7 + x Cobaltites with a Diluted Co Subsystem. J. Exp. Theor. Phys. 135, 742–751 (2022). https://doi.org/10.1134/S1063776122110061
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DOI: https://doi.org/10.1134/S1063776122110061